Sin begets its own result. This is God's law. Won't you burn our tongue if you chew a chilli? In his youth Mathur led a rather fast life; so he suffered from various diseases before his death.
One may not realize this in youth. I have looked into the hearth in the kitchen of the Kali temple when logs are being burnt. At first the wet wood burns rather well. It doesn't seem then that it contains much moisture. But when the wood is sufficiently burnt, all the moisture runs back to one end. At last water squirts from the fuel and puts out the fire.
So one should be careful about anger, passion, and greed. Take, for instance, the case of Hanuman. In a fit of anger he burnt Ceylon. At last he remembered that Sita was living in the asoka grove. Then he began to tremble lest the fire should injure her.